Signal



May 1, 192s. 1,668,343

w. SPARKSv SIGNAL originlyiled July 16. 1920 ij/ Qy A o Irl/111111111. s '0,

APatented May 1, 1928". l

UNITED STATES lPATl-:NT OFFICE.

WILLIAM SPARKS, OF JACKSON, MICHIGAN, .ASSIGNOR TO SPARKS-WIIEIN'G'TON COH- PANY, F CLEVELAND, OHIO, 'A CORPORATION OF OHIO.

stema.

,application mea :muy 1e, 1920, serial No. 396,802. neneweabmber 12, 1927.

application contains the broad claims to thev subject matter here disclosed so far as it relates to the rear bearing for the motor shaft, the claims of this application being restricted to the particular construction of the rear bearing `here shown and to the means for holdingr the shaft in contact with the rear bearing.

Another object is the production of a signal having the adjustment advantages above described in .which the' parts are normally so held in any position of adjustment as to' prevent rattling of the same under ordinary conditions of use.

. Other objects and advantages relate to the details of construction and arrangement by VV which the above set forth objects' are attained, allias will more fully appear from the following description taken inconnection with the accompanying drawings, in which A Figure 1 is a rear end view of a motor driven signal with-'the motor enclosing case removed. j

v Figure 2 ris a cross-section of the same.

Figure 3 isa front view of the same struc-v In general formythe signal illustrated is much the same as that described in Letters,

stantially U-shaped sheet metal, motor case` pole pieces -7-, lield coils -8- and commuttor brushes -9-. The armature 10 of the motor is mounted upon the armature 'shaft -11- which has one end journaled in and extending through the rear wall -12 of the motor frame -4.- and its opposite end journaled in and extending through the diaphragm case --1--, the latter end carrying forward of the said diaphragm casea toothed actuator, or cam.-21- removably 65 secured upon the shaft by means of nut -13-. The armature shaft carries a commntator -14- of any usual well known construction.

For the purpose of eiecting adjustment of the armature shaft -11- and thereby the cam --21-- toward the diaphragm 14 to properly position said cam with reference to wear-piece 15- there' is provided a bar --16- adjustably secured to the wall -12 of the case -4- by means of screw -17 said bar being normally tensioned away-from the wall --'l2 and held in contact with the head of saidscrew -17- by means of spring 18 interposed between thel said bar -16- and the rear wall -12-' of the motor frame. One end of the bar 1B- extends across the end of the motor shaft -11- so as to constitute an end thrust bearing for said shaft while the opposite end of the bar may rest in contact with or be secured to any stationary part of the dei vice, andas shown, the end -19- of said bar is bent so as to extend at substantiallyv right angles to the main portion of the bar, and rests in contact with the rear wall 12 of the-motor frame, and preferably some means is provided :for preventing lateral movement of said end portion 19 with relation to the motor frame -4-, and;Y for this purpose the wall '-.12- may be provided with a recess .or depression` adapted for receiving the said end portion -19- to pirevent any movement that would cause the endY'-20- of said b'ar to'befmoved out of alignment with the .shaft-lv It will be readily seen that' by adjusting screw 17 the end of bar 1G- will lbe moved either toward or from the wall -12-- of the motor case to thereby move or permit movement. ofV the shaft 1l to properly position cam -21- with reference to wear-piece -15. l'

It is found that the constructionxso far described -in like manner as` the usual end 110 loo thrust bearing will prevent rearward movement of the shaft -11-, but has no effect upon its free' forward movement toward wear-piece l5- with the result that under y ordinary conditions of use upon motor vehithe spring'bar being so tensioned as to eXert a thrust force upon the said shaft, tending to hold it in contact with the end -20- of bar--16-.

The operation and results of the construction will be readily understood by those skilled in the art, and the advantages ob-4 tained by such constructionhave been heretofore set forth.

Preferably any desired adjustment of the structure desired can be effected without removing the motor case -23- shown in dottedy lines in Figure 2, and for this purpose the said`cas1ng is provided with an opening adapted to` register with and through which the end of said screw -17- may project lor be accessible for adjustment pur oses whenthe casing 2S-'- is' Vin assem led position. u

rIhe ends of the motor shaft 11 may perhaps 'preferably bev of somewhat spherical fr'm so as to have substantially point l contact with'the adjusting bar 16- and the spring tensioning bar ,-22-.

Although I have shown and described a i specific construction as illustrative of a perhaps preferred .form of the invention I do not desire to limit myself to the same, as many changes may be made in the details, of form, arrangement and construction of parts without departing fromthe spirit of tlliis invention set forth in the appended c alms. 4 v

'What I claim is:

1. In a signaling device, a diaphragm, a diaphragm case section, a shaft extending through said case section, a cam member mounted on the forward portion of said shaft and between the diaphragm and said case section,` and a spring member having an end portion rigidly confined with respect to said case section and its intermediate portion projecting away from said case section and its other end portion extending across the end of said shaft for resiliently.

holding the shaft from forward displacement.

2. In an acoustic signal, the combination of an elastic diaphragm, a support therefor, a caml for vibrating said diaphragm interposed between the diaphragm and its support, a rotary shaft on which said cam 1s mounted, and thrust bearings engaging both ends of said shaft, one of said bearings com? prising aspring' interposed lbetween the diaphragm and the adjacent end of theshaft and adapted to yieldingly hold Vthe shaft against the other thrust bearing. j

.3. In an acoustic signal, the combination of an elastic diaphragm, a support therefor, a camfor vibrating said diaphragm interposed between the diaphragm and its support, a rotary shaft on which said cam is mounted, and thrust bearings engaging both ends of said shaft, one of'said bea-rings con,-

sisting of a leaf spring -interposedbetween the diaphragm and the ad'acent end of the shaft and adapted to yie dingly hold the y shaft against the other thrust bearing.

4. signaling instrument comprising anV elastic diaphragm, atsupport therefor, a rotary shaft presented endwise toward the diaphragm, a bearing for the shaft, a cam mounted on. the front 'end of the shaft between the bearing andthe diaphragm and thrust bearings engaging both ends of the shaft, one of said bearings consisting of a. 9E

spring interposed between the diaphragm and the adjacent end of the shaftand adapted to yieldingly hold the shaft against the other thrust bearing.

In witness whereof I have hereunto set my hand this 30th day of June, 1920. j WILLIAM SPARKS, 

